Allan mason



(No Model.)

A. MASON.

APPARATUS FOR BURNING GULM OR PULVERIZED GOAL. I No. 406,659. PatentedJuly' 1889.

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WITNESSES INVENTDR Mwa W q. PETERS, Pholo-Lillwgmpien Wnhmglnn. u.'c,

UNITED STATES PATENT OFFICE.

ALLAN MASON, OF BROOKLYN, ASSIGNOR TO HERBERT H. SANDERSON,

TRUSTEE, OF NEWV YORK, N. Y.

APPARATUS FOR BURNING CULM OR-PULVERIZED COAL.

SPECIFICATION forming part of Letters Patent No. 406,659, dated. July 9,1889. Application filedMarch 8, 1888- Serial No. 266,556- (No model.)

To 60% whom it may concern.-

' l Be it known that I, ALLAN MAso a citizen of the United States,residing at Brooklyn, in

companying drawings, and to the letters and figures of reference markedthereon, which along with it any yet unconsumed particles form a part ofthis specification.

My improved apparatus for burning pulverized coal consists ofcontrivances for maintaining the particles in suspension and generaldistribution throughout the combustionchamber, together with the air foreffecting the combustion, so that the mixture and union of atoms is inprocess of operation among and throughout the moving particles in allthe space and in far greater amount and intensity than as burned in amass or bed on the grate, with correspondingly more effective or perfectcombustion and greater production and intensity of heat in a givenspace, all as hereinafter described, referencebeing made to accompanyingdrawings, in which- Figure 1 is a longitudinal sectional elevation of aboiler-furnace, showing one contrivance of apparatus that may beemployed for maintaining the suspension and distribution by the cyclingcurrents produced in the furnace by an injecting-blast of air laden withthe atoms of coal. Fig. 2 is a transverse section of a locomotive-boilerfurnace with the injecting apparatus adapted for that kind of furnace.

In Fig. 1, (t represents an ordinary returnfiue boiler; b, thecombustion-chamber of the furnace; d, the fire-door; f, the flue back ofthe bridge-wa1l g. In such a furnace I provide a pan-shaped deflector h,and when required others 11 j, of refractory material, as shown, or inany approved arrangement, with an injector k for air to be forced in,preferably, at the backof the chamber by a fan Z, or other means, andcoal-dust charged into the air-spout by a screw feeder m, or othermeans, to be carried along-for feeding the furnace and for being mixedand combined with the air and held in suspension for combustion by it.It will'be seen that the blast first impinges on the pan h,locatedalittle above the ash-pit, spreading more or less, but leaving acomparatively still air-space below for reception of the ashes. Then itis turned upward violently by the deflector h, diffusing in the upperspace, where it is held up in cycles by the incoming jet below,repeatedly coming in contact with deflectors z' and j, which turn itdownward into the incoming blast, which takes and prevents them fromfalling onto pan h or over its edge into the ash-pit, said pan beingnarrower and shorter than the width and length of the chamber. It willalso be seen that these appliances maybe readily fittedto a commonboiler-furnace already in use without material expense of fitting andmay be as readily removed. For adaptation of the same .process to thecombustion-chamber b of a locomotive-boiler fire-box n theinjectingnozzle may have branches k entering near each side from belowthe grate c, and being suitably upwardly curved to constitute deflectorsfor projecting the coal upward into the opposite angles, and be therebydeflected so as to meet over the cent-er of the chamber and pro ducegyrating cycles by their counter-action, adapted to maintain thesuspension of the coal atoms until consumed. To begin with, fire may bestarted on the pan h or the coalgrate to produce theheat necessary forigniting the coal-dust, or a torclrmay be introduced through thefire-door.

For the subsequent continuance of the fire the high temperature withinthe chamber is to be depended on for reigniting the fine particles ofcoal in case of any temporary suspension due to irregularity in thefeeding of the coal; but it is intended that the coal shall be so fineand shall feed with such regularity that when properly adjusted nointerruption will occur.

By this method all the combustible matters in the coal will beeffectually consumed with greater economy of fuel, and an especialadvantage is gained in the total prevention of clinker and slag.

fall in part into the ash-pit through some localities Where the eddiesfavor it, while some may be carried over the bridge-wall and descendwhere the cycles have less suspending effect.

I am aware that a fan has been employed as a feeder merely to injectpulverized coal into the furnace upon. the fire-bed; but my invention isdistinguished from such a device in that it is specially contrived forprojecting the coal into the space above and maintaining it insuspension for combustion in the atmosphere of the furnace.

I disclaim herein the process of burning coal and hydrocarbons incombination described in my application filed March 5, 1888, Serial No.266,282; also the process of burning culm or pulverized coal, filed thesame date, No. 266,281.

WVhat I claim, and desire to secure by Letters Patent, is-

l. The combination, with a furnace-chamber, of an air andpulverized-coal injector upwardly projecting the injected coal into thechambers provided with deflectingsurfaces, as shown, thereby maintainingthe coal in suspension during combustion above a still air-space in thelower part of the furnacechamber for reception of the ashes,substantially as described.

2. The combination, with a furnace-chamber, of an air andpulverized-coal injector and deflectors in the chamber upwardlyprojecting and maintaining the coal in suspension during combustionabove a still air-space in the lower part of the furnace-chamber forreception of the ashes, substantially as dethat direct, diliuse, and,with the currents of injected air, maintain the coal in suspensionduring combustion, substantially as de scribed.

In testimony whereof I afiix my signature in presence of two witnesses.

ALLAN MASON.

Witnesses:

W. J. MORGAN, A. P. THAYER.

